1 /* 2 * EAP peer method: EAP-FAST (RFC 4851) 3 * Copyright (c) 2004-2008, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #include "includes.h" 10 11 #include "common.h" 12 #include "crypto/tls.h" 13 #include "crypto/sha1.h" 14 #include "eap_common/eap_tlv_common.h" 15 #include "eap_i.h" 16 #include "eap_tls_common.h" 17 #include "eap_config.h" 18 #include "eap_fast_pac.h" 19 20 #ifdef EAP_FAST_DYNAMIC 21 #include "eap_fast_pac.c" 22 #endif /* EAP_FAST_DYNAMIC */ 23 24 /* TODO: 25 * - test session resumption and enable it if it interoperates 26 * - password change (pending mschapv2 packet; replay decrypted packet) 27 */ 28 29 30 static void eap_fast_deinit(struct eap_sm *sm, void *priv); 31 32 33 struct eap_fast_data { 34 struct eap_ssl_data ssl; 35 36 int fast_version; 37 38 const struct eap_method *phase2_method; 39 void *phase2_priv; 40 int phase2_success; 41 42 struct eap_method_type phase2_type; 43 struct eap_method_type *phase2_types; 44 size_t num_phase2_types; 45 int resuming; /* starting a resumed session */ 46 struct eap_fast_key_block_provisioning *key_block_p; 47 #define EAP_FAST_PROV_UNAUTH 1 48 #define EAP_FAST_PROV_AUTH 2 49 int provisioning_allowed; /* Allowed PAC provisioning modes */ 50 int provisioning; /* doing PAC provisioning (not the normal auth) */ 51 int anon_provisioning; /* doing anonymous (unauthenticated) 52 * provisioning */ 53 int session_ticket_used; 54 55 u8 key_data[EAP_FAST_KEY_LEN]; 56 u8 *session_id; 57 size_t id_len; 58 u8 emsk[EAP_EMSK_LEN]; 59 int success; 60 61 struct eap_fast_pac *pac; 62 struct eap_fast_pac *current_pac; 63 size_t max_pac_list_len; 64 int use_pac_binary_format; 65 66 u8 simck[EAP_FAST_SIMCK_LEN]; 67 int simck_idx; 68 69 struct wpabuf *pending_phase2_req; 70 }; 71 72 73 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len, 74 const u8 *client_random, 75 const u8 *server_random, 76 u8 *master_secret) 77 { 78 struct eap_fast_data *data = ctx; 79 80 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback"); 81 82 if (client_random == NULL || server_random == NULL || 83 master_secret == NULL) { 84 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall " 85 "back to full TLS handshake"); 86 data->session_ticket_used = 0; 87 if (data->provisioning_allowed) { 88 wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a " 89 "new PAC-Key"); 90 data->provisioning = 1; 91 data->current_pac = NULL; 92 } 93 return 0; 94 } 95 96 wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len); 97 98 if (data->current_pac == NULL) { 99 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for " 100 "using SessionTicket"); 101 data->session_ticket_used = 0; 102 return 0; 103 } 104 105 eap_fast_derive_master_secret(data->current_pac->pac_key, 106 server_random, client_random, 107 master_secret); 108 109 data->session_ticket_used = 1; 110 111 return 1; 112 } 113 114 115 static int eap_fast_parse_phase1(struct eap_fast_data *data, 116 const char *phase1) 117 { 118 const char *pos; 119 120 pos = os_strstr(phase1, "fast_provisioning="); 121 if (pos) { 122 data->provisioning_allowed = atoi(pos + 18); 123 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning " 124 "mode: %d", data->provisioning_allowed); 125 } 126 127 pos = os_strstr(phase1, "fast_max_pac_list_len="); 128 if (pos) { 129 data->max_pac_list_len = atoi(pos + 22); 130 if (data->max_pac_list_len == 0) 131 data->max_pac_list_len = 1; 132 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu", 133 (unsigned long) data->max_pac_list_len); 134 } 135 136 pos = os_strstr(phase1, "fast_pac_format=binary"); 137 if (pos) { 138 data->use_pac_binary_format = 1; 139 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC " 140 "list"); 141 } 142 143 return 0; 144 } 145 146 147 static void * eap_fast_init(struct eap_sm *sm) 148 { 149 struct eap_fast_data *data; 150 struct eap_peer_config *config = eap_get_config(sm); 151 152 if (config == NULL) 153 return NULL; 154 155 data = os_zalloc(sizeof(*data)); 156 if (data == NULL) 157 return NULL; 158 data->fast_version = EAP_FAST_VERSION; 159 data->max_pac_list_len = 10; 160 161 if (config->phase1 && eap_fast_parse_phase1(data, config->phase1) < 0) { 162 eap_fast_deinit(sm, data); 163 return NULL; 164 } 165 166 if (eap_peer_select_phase2_methods(config, "auth=", 167 &data->phase2_types, 168 &data->num_phase2_types) < 0) { 169 eap_fast_deinit(sm, data); 170 return NULL; 171 } 172 173 data->phase2_type.vendor = EAP_VENDOR_IETF; 174 data->phase2_type.method = EAP_TYPE_NONE; 175 176 if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) { 177 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL."); 178 eap_fast_deinit(sm, data); 179 return NULL; 180 } 181 182 if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn, 183 eap_fast_session_ticket_cb, 184 data) < 0) { 185 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket " 186 "callback"); 187 eap_fast_deinit(sm, data); 188 return NULL; 189 } 190 191 /* 192 * The local RADIUS server in a Cisco AP does not seem to like empty 193 * fragments before data, so disable that workaround for CBC. 194 * TODO: consider making this configurable 195 */ 196 if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) { 197 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS " 198 "workarounds"); 199 } 200 201 if (!config->pac_file) { 202 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured"); 203 eap_fast_deinit(sm, data); 204 return NULL; 205 } 206 207 if (data->use_pac_binary_format && 208 eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) { 209 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 210 eap_fast_deinit(sm, data); 211 return NULL; 212 } 213 214 if (!data->use_pac_binary_format && 215 eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) { 216 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file"); 217 eap_fast_deinit(sm, data); 218 return NULL; 219 } 220 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 221 222 if (data->pac == NULL && !data->provisioning_allowed) { 223 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and " 224 "provisioning disabled"); 225 eap_fast_deinit(sm, data); 226 return NULL; 227 } 228 229 return data; 230 } 231 232 233 static void eap_fast_deinit(struct eap_sm *sm, void *priv) 234 { 235 struct eap_fast_data *data = priv; 236 struct eap_fast_pac *pac, *prev; 237 238 if (data == NULL) 239 return; 240 if (data->phase2_priv && data->phase2_method) 241 data->phase2_method->deinit(sm, data->phase2_priv); 242 os_free(data->phase2_types); 243 os_free(data->key_block_p); 244 eap_peer_tls_ssl_deinit(sm, &data->ssl); 245 246 pac = data->pac; 247 prev = NULL; 248 while (pac) { 249 prev = pac; 250 pac = pac->next; 251 eap_fast_free_pac(prev); 252 } 253 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 254 os_memset(data->emsk, 0, EAP_EMSK_LEN); 255 os_free(data->session_id); 256 wpabuf_free(data->pending_phase2_req); 257 os_free(data); 258 } 259 260 261 static int eap_fast_derive_msk(struct eap_fast_data *data) 262 { 263 eap_fast_derive_eap_msk(data->simck, data->key_data); 264 eap_fast_derive_eap_emsk(data->simck, data->emsk); 265 data->success = 1; 266 return 0; 267 } 268 269 270 static void eap_fast_derive_key_auth(struct eap_sm *sm, 271 struct eap_fast_data *data) 272 { 273 u8 *sks; 274 275 /* RFC 4851, Section 5.1: 276 * Extra key material after TLS key_block: session_key_seed[40] 277 */ 278 279 sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion", 280 EAP_FAST_SKS_LEN); 281 if (sks == NULL) { 282 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive " 283 "session_key_seed"); 284 return; 285 } 286 287 /* 288 * RFC 4851, Section 5.2: 289 * S-IMCK[0] = session_key_seed 290 */ 291 wpa_hexdump_key(MSG_DEBUG, 292 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 293 sks, EAP_FAST_SKS_LEN); 294 data->simck_idx = 0; 295 os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN); 296 os_free(sks); 297 } 298 299 300 static void eap_fast_derive_key_provisioning(struct eap_sm *sm, 301 struct eap_fast_data *data) 302 { 303 os_free(data->key_block_p); 304 data->key_block_p = (struct eap_fast_key_block_provisioning *) 305 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, 306 "key expansion", 307 sizeof(*data->key_block_p)); 308 if (data->key_block_p == NULL) { 309 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block"); 310 return; 311 } 312 /* 313 * RFC 4851, Section 5.2: 314 * S-IMCK[0] = session_key_seed 315 */ 316 wpa_hexdump_key(MSG_DEBUG, 317 "EAP-FAST: session_key_seed (SKS = S-IMCK[0])", 318 data->key_block_p->session_key_seed, 319 sizeof(data->key_block_p->session_key_seed)); 320 data->simck_idx = 0; 321 os_memcpy(data->simck, data->key_block_p->session_key_seed, 322 EAP_FAST_SIMCK_LEN); 323 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge", 324 data->key_block_p->server_challenge, 325 sizeof(data->key_block_p->server_challenge)); 326 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge", 327 data->key_block_p->client_challenge, 328 sizeof(data->key_block_p->client_challenge)); 329 } 330 331 332 static void eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data) 333 { 334 if (data->anon_provisioning) 335 eap_fast_derive_key_provisioning(sm, data); 336 else 337 eap_fast_derive_key_auth(sm, data); 338 } 339 340 341 static int eap_fast_init_phase2_method(struct eap_sm *sm, 342 struct eap_fast_data *data) 343 { 344 data->phase2_method = 345 eap_peer_get_eap_method(data->phase2_type.vendor, 346 data->phase2_type.method); 347 if (data->phase2_method == NULL) 348 return -1; 349 350 if (data->key_block_p) { 351 sm->auth_challenge = data->key_block_p->server_challenge; 352 sm->peer_challenge = data->key_block_p->client_challenge; 353 } 354 sm->init_phase2 = 1; 355 data->phase2_priv = data->phase2_method->init(sm); 356 sm->init_phase2 = 0; 357 sm->auth_challenge = NULL; 358 sm->peer_challenge = NULL; 359 360 return data->phase2_priv == NULL ? -1 : 0; 361 } 362 363 364 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type) 365 { 366 size_t i; 367 368 /* TODO: TNC with anonymous provisioning; need to require both 369 * completed MSCHAPv2 and TNC */ 370 371 if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) { 372 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed " 373 "during unauthenticated provisioning; reject phase2" 374 " type %d", type); 375 return -1; 376 } 377 378 #ifdef EAP_TNC 379 if (type == EAP_TYPE_TNC) { 380 data->phase2_type.vendor = EAP_VENDOR_IETF; 381 data->phase2_type.method = EAP_TYPE_TNC; 382 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 383 "vendor %d method %d for TNC", 384 data->phase2_type.vendor, 385 data->phase2_type.method); 386 return 0; 387 } 388 #endif /* EAP_TNC */ 389 390 for (i = 0; i < data->num_phase2_types; i++) { 391 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF || 392 data->phase2_types[i].method != type) 393 continue; 394 395 data->phase2_type.vendor = data->phase2_types[i].vendor; 396 data->phase2_type.method = data->phase2_types[i].method; 397 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP " 398 "vendor %d method %d", 399 data->phase2_type.vendor, 400 data->phase2_type.method); 401 break; 402 } 403 404 if (type != data->phase2_type.method || type == EAP_TYPE_NONE) 405 return -1; 406 407 return 0; 408 } 409 410 411 static int eap_fast_phase2_request(struct eap_sm *sm, 412 struct eap_fast_data *data, 413 struct eap_method_ret *ret, 414 struct eap_hdr *hdr, 415 struct wpabuf **resp) 416 { 417 size_t len = be_to_host16(hdr->length); 418 u8 *pos; 419 struct eap_method_ret iret; 420 struct eap_peer_config *config = eap_get_config(sm); 421 struct wpabuf msg; 422 423 if (len <= sizeof(struct eap_hdr)) { 424 wpa_printf(MSG_INFO, "EAP-FAST: too short " 425 "Phase 2 request (len=%lu)", (unsigned long) len); 426 return -1; 427 } 428 pos = (u8 *) (hdr + 1); 429 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos); 430 if (*pos == EAP_TYPE_IDENTITY) { 431 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); 432 return 0; 433 } 434 435 if (data->phase2_priv && data->phase2_method && 436 *pos != data->phase2_type.method) { 437 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - " 438 "deinitialize previous method"); 439 data->phase2_method->deinit(sm, data->phase2_priv); 440 data->phase2_method = NULL; 441 data->phase2_priv = NULL; 442 data->phase2_type.vendor = EAP_VENDOR_IETF; 443 data->phase2_type.method = EAP_TYPE_NONE; 444 } 445 446 if (data->phase2_type.vendor == EAP_VENDOR_IETF && 447 data->phase2_type.method == EAP_TYPE_NONE && 448 eap_fast_select_phase2_method(data, *pos) < 0) { 449 if (eap_peer_tls_phase2_nak(data->phase2_types, 450 data->num_phase2_types, 451 hdr, resp)) 452 return -1; 453 return 0; 454 } 455 456 if ((data->phase2_priv == NULL && 457 eap_fast_init_phase2_method(sm, data) < 0) || 458 data->phase2_method == NULL) { 459 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize " 460 "Phase 2 EAP method %d", *pos); 461 ret->methodState = METHOD_DONE; 462 ret->decision = DECISION_FAIL; 463 return -1; 464 } 465 466 os_memset(&iret, 0, sizeof(iret)); 467 wpabuf_set(&msg, hdr, len); 468 *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, 469 &msg); 470 if (*resp == NULL || 471 (iret.methodState == METHOD_DONE && 472 iret.decision == DECISION_FAIL)) { 473 ret->methodState = METHOD_DONE; 474 ret->decision = DECISION_FAIL; 475 } else if ((iret.methodState == METHOD_DONE || 476 iret.methodState == METHOD_MAY_CONT) && 477 (iret.decision == DECISION_UNCOND_SUCC || 478 iret.decision == DECISION_COND_SUCC)) { 479 data->phase2_success = 1; 480 } 481 482 if (*resp == NULL && config && 483 (config->pending_req_identity || config->pending_req_password || 484 config->pending_req_otp || config->pending_req_new_password)) { 485 wpabuf_free(data->pending_phase2_req); 486 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len); 487 } else if (*resp == NULL) 488 return -1; 489 490 return 0; 491 } 492 493 494 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type) 495 { 496 struct wpabuf *buf; 497 struct eap_tlv_nak_tlv *nak; 498 buf = wpabuf_alloc(sizeof(*nak)); 499 if (buf == NULL) 500 return NULL; 501 nak = wpabuf_put(buf, sizeof(*nak)); 502 nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV); 503 nak->length = host_to_be16(6); 504 nak->vendor_id = host_to_be32(vendor_id); 505 nak->nak_type = host_to_be16(tlv_type); 506 return buf; 507 } 508 509 510 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate) 511 { 512 struct wpabuf *buf; 513 struct eap_tlv_intermediate_result_tlv *result; 514 buf = wpabuf_alloc(sizeof(*result)); 515 if (buf == NULL) 516 return NULL; 517 wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)", 518 intermediate ? "Intermediate " : "", status); 519 result = wpabuf_put(buf, sizeof(*result)); 520 result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 521 (intermediate ? 522 EAP_TLV_INTERMEDIATE_RESULT_TLV : 523 EAP_TLV_RESULT_TLV)); 524 result->length = host_to_be16(2); 525 result->status = host_to_be16(status); 526 return buf; 527 } 528 529 530 static struct wpabuf * eap_fast_tlv_pac_ack(void) 531 { 532 struct wpabuf *buf; 533 struct eap_tlv_result_tlv *res; 534 struct eap_tlv_pac_ack_tlv *ack; 535 536 buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack)); 537 if (buf == NULL) 538 return NULL; 539 540 wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)"); 541 ack = wpabuf_put(buf, sizeof(*ack)); 542 ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV | 543 EAP_TLV_TYPE_MANDATORY); 544 ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr)); 545 ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT); 546 ack->pac_len = host_to_be16(2); 547 ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS); 548 549 return buf; 550 } 551 552 553 static struct wpabuf * eap_fast_process_eap_payload_tlv( 554 struct eap_sm *sm, struct eap_fast_data *data, 555 struct eap_method_ret *ret, 556 u8 *eap_payload_tlv, size_t eap_payload_tlv_len) 557 { 558 struct eap_hdr *hdr; 559 struct wpabuf *resp = NULL; 560 561 if (eap_payload_tlv_len < sizeof(*hdr)) { 562 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP " 563 "Payload TLV (len=%lu)", 564 (unsigned long) eap_payload_tlv_len); 565 return NULL; 566 } 567 568 hdr = (struct eap_hdr *) eap_payload_tlv; 569 if (be_to_host16(hdr->length) > eap_payload_tlv_len) { 570 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in " 571 "EAP Payload TLV"); 572 return NULL; 573 } 574 575 if (hdr->code != EAP_CODE_REQUEST) { 576 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in " 577 "Phase 2 EAP header", hdr->code); 578 return NULL; 579 } 580 581 if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) { 582 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing " 583 "failed"); 584 return NULL; 585 } 586 587 return eap_fast_tlv_eap_payload(resp); 588 } 589 590 591 static int eap_fast_validate_crypto_binding( 592 struct eap_tlv_crypto_binding_tlv *_bind) 593 { 594 wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d " 595 "Received Version %d SubType %d", 596 _bind->version, _bind->received_version, _bind->subtype); 597 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 598 _bind->nonce, sizeof(_bind->nonce)); 599 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 600 _bind->compound_mac, sizeof(_bind->compound_mac)); 601 602 if (_bind->version != EAP_FAST_VERSION || 603 _bind->received_version != EAP_FAST_VERSION || 604 _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) { 605 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in " 606 "Crypto-Binding TLV: Version %d " 607 "Received Version %d SubType %d", 608 _bind->version, _bind->received_version, 609 _bind->subtype); 610 return -1; 611 } 612 613 return 0; 614 } 615 616 617 static void eap_fast_write_crypto_binding( 618 struct eap_tlv_crypto_binding_tlv *rbind, 619 struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk) 620 { 621 rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | 622 EAP_TLV_CRYPTO_BINDING_TLV); 623 rbind->length = host_to_be16(sizeof(*rbind) - 624 sizeof(struct eap_tlv_hdr)); 625 rbind->version = EAP_FAST_VERSION; 626 rbind->received_version = _bind->version; 627 rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE; 628 os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce)); 629 inc_byte_array(rbind->nonce, sizeof(rbind->nonce)); 630 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind), 631 rbind->compound_mac); 632 633 wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d " 634 "Received Version %d SubType %d", 635 rbind->version, rbind->received_version, rbind->subtype); 636 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE", 637 rbind->nonce, sizeof(rbind->nonce)); 638 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC", 639 rbind->compound_mac, sizeof(rbind->compound_mac)); 640 } 641 642 643 static int eap_fast_get_phase2_key(struct eap_sm *sm, 644 struct eap_fast_data *data, 645 u8 *isk, size_t isk_len) 646 { 647 u8 *key; 648 size_t key_len; 649 650 os_memset(isk, 0, isk_len); 651 652 if (data->phase2_method == NULL || data->phase2_priv == NULL) { 653 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not " 654 "available"); 655 return -1; 656 } 657 658 if (data->phase2_method->isKeyAvailable == NULL || 659 data->phase2_method->getKey == NULL) 660 return 0; 661 662 if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) || 663 (key = data->phase2_method->getKey(sm, data->phase2_priv, 664 &key_len)) == NULL) { 665 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material " 666 "from Phase 2"); 667 return -1; 668 } 669 670 if (key_len > isk_len) 671 key_len = isk_len; 672 if (key_len == 32 && 673 data->phase2_method->vendor == EAP_VENDOR_IETF && 674 data->phase2_method->method == EAP_TYPE_MSCHAPV2) { 675 /* 676 * EAP-FAST uses reverse order for MS-MPPE keys when deriving 677 * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct 678 * ISK for EAP-FAST cryptobinding. 679 */ 680 os_memcpy(isk, key + 16, 16); 681 os_memcpy(isk + 16, key, 16); 682 } else 683 os_memcpy(isk, key, key_len); 684 os_free(key); 685 686 return 0; 687 } 688 689 690 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data, 691 u8 *cmk) 692 { 693 u8 isk[32], imck[60]; 694 695 wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC " 696 "calculation", data->simck_idx + 1); 697 698 /* 699 * RFC 4851, Section 5.2: 700 * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys", 701 * MSK[j], 60) 702 * S-IMCK[j] = first 40 octets of IMCK[j] 703 * CMK[j] = last 20 octets of IMCK[j] 704 */ 705 706 if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0) 707 return -1; 708 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk)); 709 sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN, 710 "Inner Methods Compound Keys", 711 isk, sizeof(isk), imck, sizeof(imck)); 712 data->simck_idx++; 713 os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN); 714 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]", 715 data->simck, EAP_FAST_SIMCK_LEN); 716 os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN); 717 wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]", 718 cmk, EAP_FAST_CMK_LEN); 719 720 return 0; 721 } 722 723 724 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type) 725 { 726 struct eap_tlv_hdr *pac; 727 struct eap_tlv_request_action_tlv *act; 728 struct eap_tlv_pac_type_tlv *type; 729 730 act = (struct eap_tlv_request_action_tlv *) pos; 731 act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV); 732 act->length = host_to_be16(2); 733 act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV); 734 735 pac = (struct eap_tlv_hdr *) (act + 1); 736 pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV); 737 pac->length = host_to_be16(sizeof(*type)); 738 739 type = (struct eap_tlv_pac_type_tlv *) (pac + 1); 740 type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE); 741 type->length = host_to_be16(2); 742 type->pac_type = host_to_be16(pac_type); 743 744 return (u8 *) (type + 1); 745 } 746 747 748 static struct wpabuf * eap_fast_process_crypto_binding( 749 struct eap_sm *sm, struct eap_fast_data *data, 750 struct eap_method_ret *ret, 751 struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len) 752 { 753 struct wpabuf *resp; 754 u8 *pos; 755 u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN]; 756 int res; 757 size_t len; 758 759 if (eap_fast_validate_crypto_binding(_bind) < 0) 760 return NULL; 761 762 if (eap_fast_get_cmk(sm, data, cmk) < 0) 763 return NULL; 764 765 /* Validate received Compound MAC */ 766 os_memcpy(cmac, _bind->compound_mac, sizeof(cmac)); 767 os_memset(_bind->compound_mac, 0, sizeof(cmac)); 768 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound " 769 "MAC calculation", (u8 *) _bind, bind_len); 770 hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len, 771 _bind->compound_mac); 772 res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac)); 773 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC", 774 cmac, sizeof(cmac)); 775 wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC", 776 _bind->compound_mac, sizeof(cmac)); 777 if (res != 0) { 778 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match"); 779 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac)); 780 return NULL; 781 } 782 783 /* 784 * Compound MAC was valid, so authentication succeeded. Reply with 785 * crypto binding to allow server to complete authentication. 786 */ 787 788 len = sizeof(struct eap_tlv_crypto_binding_tlv); 789 resp = wpabuf_alloc(len); 790 if (resp == NULL) 791 return NULL; 792 793 if (!data->anon_provisioning && data->phase2_success && 794 eap_fast_derive_msk(data) < 0) { 795 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK"); 796 ret->methodState = METHOD_DONE; 797 ret->decision = DECISION_FAIL; 798 data->phase2_success = 0; 799 wpabuf_free(resp); 800 return NULL; 801 } 802 803 if (!data->anon_provisioning && data->phase2_success) { 804 os_free(data->session_id); 805 data->session_id = eap_peer_tls_derive_session_id( 806 sm, &data->ssl, EAP_TYPE_FAST, &data->id_len); 807 if (data->session_id) { 808 wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id", 809 data->session_id, data->id_len); 810 } else { 811 wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive " 812 "Session-Id"); 813 wpabuf_free(resp); 814 return NULL; 815 } 816 } 817 818 pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv)); 819 eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *) 820 pos, _bind, cmk); 821 822 return resp; 823 } 824 825 826 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type, 827 u8 *pos, size_t len, int *pac_key_found) 828 { 829 switch (type & 0x7fff) { 830 case PAC_TYPE_PAC_KEY: 831 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len); 832 if (len != EAP_FAST_PAC_KEY_LEN) { 833 wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key " 834 "length %lu", (unsigned long) len); 835 break; 836 } 837 *pac_key_found = 1; 838 os_memcpy(entry->pac_key, pos, len); 839 break; 840 case PAC_TYPE_PAC_OPAQUE: 841 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len); 842 entry->pac_opaque = pos; 843 entry->pac_opaque_len = len; 844 break; 845 case PAC_TYPE_PAC_INFO: 846 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len); 847 entry->pac_info = pos; 848 entry->pac_info_len = len; 849 break; 850 default: 851 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d", 852 type); 853 break; 854 } 855 } 856 857 858 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry, 859 u8 *pac, size_t pac_len) 860 { 861 struct pac_tlv_hdr *hdr; 862 u8 *pos; 863 size_t left, len; 864 int type, pac_key_found = 0; 865 866 pos = pac; 867 left = pac_len; 868 869 while (left > sizeof(*hdr)) { 870 hdr = (struct pac_tlv_hdr *) pos; 871 type = be_to_host16(hdr->type); 872 len = be_to_host16(hdr->len); 873 pos += sizeof(*hdr); 874 left -= sizeof(*hdr); 875 if (len > left) { 876 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun " 877 "(type=%d len=%lu left=%lu)", 878 type, (unsigned long) len, 879 (unsigned long) left); 880 return -1; 881 } 882 883 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found); 884 885 pos += len; 886 left -= len; 887 } 888 889 if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) { 890 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include " 891 "all the required fields"); 892 return -1; 893 } 894 895 return 0; 896 } 897 898 899 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type, 900 u8 *pos, size_t len) 901 { 902 u16 pac_type; 903 u32 lifetime; 904 struct os_time now; 905 906 switch (type & 0x7fff) { 907 case PAC_TYPE_CRED_LIFETIME: 908 if (len != 4) { 909 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - " 910 "Invalid CRED_LIFETIME length - ignored", 911 pos, len); 912 return 0; 913 } 914 915 /* 916 * This is not currently saved separately in PAC files since 917 * the server can automatically initiate PAC update when 918 * needed. Anyway, the information is available from PAC-Info 919 * dump if it is needed for something in the future. 920 */ 921 lifetime = WPA_GET_BE32(pos); 922 os_get_time(&now); 923 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d " 924 "(%d days)", 925 lifetime, (lifetime - (u32) now.sec) / 86400); 926 break; 927 case PAC_TYPE_A_ID: 928 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID", 929 pos, len); 930 entry->a_id = pos; 931 entry->a_id_len = len; 932 break; 933 case PAC_TYPE_I_ID: 934 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID", 935 pos, len); 936 entry->i_id = pos; 937 entry->i_id_len = len; 938 break; 939 case PAC_TYPE_A_ID_INFO: 940 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info", 941 pos, len); 942 entry->a_id_info = pos; 943 entry->a_id_info_len = len; 944 break; 945 case PAC_TYPE_PAC_TYPE: 946 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */ 947 if (len != 2) { 948 wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type " 949 "length %lu (expected 2)", 950 (unsigned long) len); 951 wpa_hexdump_ascii(MSG_DEBUG, 952 "EAP-FAST: PAC-Info - PAC-Type", 953 pos, len); 954 return -1; 955 } 956 pac_type = WPA_GET_BE16(pos); 957 if (pac_type != PAC_TYPE_TUNNEL_PAC && 958 pac_type != PAC_TYPE_USER_AUTHORIZATION && 959 pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) { 960 wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type " 961 "%d", pac_type); 962 return -1; 963 } 964 965 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d", 966 pac_type); 967 entry->pac_type = pac_type; 968 break; 969 default: 970 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info " 971 "type %d", type); 972 break; 973 } 974 975 return 0; 976 } 977 978 979 static int eap_fast_process_pac_info(struct eap_fast_pac *entry) 980 { 981 struct pac_tlv_hdr *hdr; 982 u8 *pos; 983 size_t left, len; 984 int type; 985 986 /* RFC 5422, Section 4.2.4 */ 987 988 /* PAC-Type defaults to Tunnel PAC (Type 1) */ 989 entry->pac_type = PAC_TYPE_TUNNEL_PAC; 990 991 pos = entry->pac_info; 992 left = entry->pac_info_len; 993 while (left > sizeof(*hdr)) { 994 hdr = (struct pac_tlv_hdr *) pos; 995 type = be_to_host16(hdr->type); 996 len = be_to_host16(hdr->len); 997 pos += sizeof(*hdr); 998 left -= sizeof(*hdr); 999 if (len > left) { 1000 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun " 1001 "(type=%d len=%lu left=%lu)", 1002 type, (unsigned long) len, 1003 (unsigned long) left); 1004 return -1; 1005 } 1006 1007 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0) 1008 return -1; 1009 1010 pos += len; 1011 left -= len; 1012 } 1013 1014 if (entry->a_id == NULL || entry->a_id_info == NULL) { 1015 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include " 1016 "all the required fields"); 1017 return -1; 1018 } 1019 1020 return 0; 1021 } 1022 1023 1024 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm, 1025 struct eap_fast_data *data, 1026 struct eap_method_ret *ret, 1027 u8 *pac, size_t pac_len) 1028 { 1029 struct eap_peer_config *config = eap_get_config(sm); 1030 struct eap_fast_pac entry; 1031 1032 os_memset(&entry, 0, sizeof(entry)); 1033 if (eap_fast_process_pac_tlv(&entry, pac, pac_len) || 1034 eap_fast_process_pac_info(&entry)) 1035 return NULL; 1036 1037 eap_fast_add_pac(&data->pac, &data->current_pac, &entry); 1038 eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len); 1039 if (data->use_pac_binary_format) 1040 eap_fast_save_pac_bin(sm, data->pac, config->pac_file); 1041 else 1042 eap_fast_save_pac(sm, data->pac, config->pac_file); 1043 1044 if (data->provisioning) { 1045 if (data->anon_provisioning) { 1046 /* 1047 * Unauthenticated provisioning does not provide keying 1048 * material and must end with an EAP-Failure. 1049 * Authentication will be done separately after this. 1050 */ 1051 data->success = 0; 1052 ret->decision = DECISION_FAIL; 1053 } else { 1054 /* 1055 * Server may or may not allow authenticated 1056 * provisioning also for key generation. 1057 */ 1058 ret->decision = DECISION_COND_SUCC; 1059 } 1060 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1061 "- Provisioning completed successfully"); 1062 sm->expected_failure = 1; 1063 } else { 1064 /* 1065 * This is PAC refreshing, i.e., normal authentication that is 1066 * expected to be completed with an EAP-Success. However, 1067 * RFC 5422, Section 3.5 allows EAP-Failure to be sent even 1068 * after protected success exchange in case of EAP-Fast 1069 * provisioning, so we better use DECISION_COND_SUCC here 1070 * instead of DECISION_UNCOND_SUCC. 1071 */ 1072 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV " 1073 "- PAC refreshing completed successfully"); 1074 ret->decision = DECISION_COND_SUCC; 1075 } 1076 ret->methodState = METHOD_DONE; 1077 return eap_fast_tlv_pac_ack(); 1078 } 1079 1080 1081 static int eap_fast_parse_decrypted(struct wpabuf *decrypted, 1082 struct eap_fast_tlv_parse *tlv, 1083 struct wpabuf **resp) 1084 { 1085 int mandatory, tlv_type, res; 1086 size_t len; 1087 u8 *pos, *end; 1088 1089 os_memset(tlv, 0, sizeof(*tlv)); 1090 1091 /* Parse TLVs from the decrypted Phase 2 data */ 1092 pos = wpabuf_mhead(decrypted); 1093 end = pos + wpabuf_len(decrypted); 1094 while (pos + 4 < end) { 1095 mandatory = pos[0] & 0x80; 1096 tlv_type = WPA_GET_BE16(pos) & 0x3fff; 1097 pos += 2; 1098 len = WPA_GET_BE16(pos); 1099 pos += 2; 1100 if (len > (size_t) (end - pos)) { 1101 wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow"); 1102 return -1; 1103 } 1104 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: " 1105 "TLV type %d length %u%s", 1106 tlv_type, (unsigned int) len, 1107 mandatory ? " (mandatory)" : ""); 1108 1109 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len); 1110 if (res == -2) 1111 break; 1112 if (res < 0) { 1113 if (mandatory) { 1114 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown " 1115 "mandatory TLV type %d", tlv_type); 1116 *resp = eap_fast_tlv_nak(0, tlv_type); 1117 break; 1118 } else { 1119 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored " 1120 "unknown optional TLV type %d", 1121 tlv_type); 1122 } 1123 } 1124 1125 pos += len; 1126 } 1127 1128 return 0; 1129 } 1130 1131 1132 static int eap_fast_encrypt_response(struct eap_sm *sm, 1133 struct eap_fast_data *data, 1134 struct wpabuf *resp, 1135 u8 identifier, struct wpabuf **out_data) 1136 { 1137 if (resp == NULL) 1138 return 0; 1139 1140 wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data", 1141 resp); 1142 if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1143 data->fast_version, identifier, 1144 resp, out_data)) { 1145 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 " 1146 "frame"); 1147 } 1148 wpabuf_free(resp); 1149 1150 return 0; 1151 } 1152 1153 1154 static struct wpabuf * eap_fast_pac_request(void) 1155 { 1156 struct wpabuf *tmp; 1157 u8 *pos, *pos2; 1158 1159 tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) + 1160 sizeof(struct eap_tlv_request_action_tlv) + 1161 sizeof(struct eap_tlv_pac_type_tlv)); 1162 if (tmp == NULL) 1163 return NULL; 1164 1165 pos = wpabuf_put(tmp, 0); 1166 pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC); 1167 wpabuf_put(tmp, pos2 - pos); 1168 return tmp; 1169 } 1170 1171 1172 static int eap_fast_process_decrypted(struct eap_sm *sm, 1173 struct eap_fast_data *data, 1174 struct eap_method_ret *ret, 1175 const struct eap_hdr *req, 1176 struct wpabuf *decrypted, 1177 struct wpabuf **out_data) 1178 { 1179 struct wpabuf *resp = NULL, *tmp; 1180 struct eap_fast_tlv_parse tlv; 1181 int failed = 0; 1182 1183 if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0) 1184 return 0; 1185 if (resp) 1186 return eap_fast_encrypt_response(sm, data, resp, 1187 req->identifier, out_data); 1188 1189 if (tlv.result == EAP_TLV_RESULT_FAILURE) { 1190 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1191 return eap_fast_encrypt_response(sm, data, resp, 1192 req->identifier, out_data); 1193 } 1194 1195 if (tlv.iresult == EAP_TLV_RESULT_FAILURE) { 1196 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1); 1197 return eap_fast_encrypt_response(sm, data, resp, 1198 req->identifier, out_data); 1199 } 1200 1201 if (tlv.crypto_binding) { 1202 tmp = eap_fast_process_crypto_binding(sm, data, ret, 1203 tlv.crypto_binding, 1204 tlv.crypto_binding_len); 1205 if (tmp == NULL) 1206 failed = 1; 1207 else 1208 resp = wpabuf_concat(resp, tmp); 1209 } 1210 1211 if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) { 1212 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE : 1213 EAP_TLV_RESULT_SUCCESS, 1); 1214 resp = wpabuf_concat(resp, tmp); 1215 } 1216 1217 if (tlv.eap_payload_tlv) { 1218 tmp = eap_fast_process_eap_payload_tlv( 1219 sm, data, ret, tlv.eap_payload_tlv, 1220 tlv.eap_payload_tlv_len); 1221 resp = wpabuf_concat(resp, tmp); 1222 } 1223 1224 if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) { 1225 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV " 1226 "acknowledging success"); 1227 failed = 1; 1228 } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) { 1229 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac, 1230 tlv.pac_len); 1231 resp = wpabuf_concat(resp, tmp); 1232 } 1233 1234 if (data->current_pac == NULL && data->provisioning && 1235 !data->anon_provisioning && !tlv.pac && 1236 (tlv.iresult == EAP_TLV_RESULT_SUCCESS || 1237 tlv.result == EAP_TLV_RESULT_SUCCESS)) { 1238 /* 1239 * Need to request Tunnel PAC when using authenticated 1240 * provisioning. 1241 */ 1242 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC"); 1243 tmp = eap_fast_pac_request(); 1244 resp = wpabuf_concat(resp, tmp); 1245 } 1246 1247 if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) { 1248 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0); 1249 resp = wpabuf_concat(tmp, resp); 1250 } else if (failed) { 1251 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0); 1252 resp = wpabuf_concat(tmp, resp); 1253 } 1254 1255 if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed && 1256 tlv.crypto_binding && data->phase2_success) { 1257 if (data->anon_provisioning) { 1258 wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated " 1259 "provisioning completed successfully."); 1260 ret->methodState = METHOD_DONE; 1261 ret->decision = DECISION_FAIL; 1262 sm->expected_failure = 1; 1263 } else { 1264 wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication " 1265 "completed successfully."); 1266 if (data->provisioning) 1267 ret->methodState = METHOD_MAY_CONT; 1268 else 1269 ret->methodState = METHOD_DONE; 1270 ret->decision = DECISION_UNCOND_SUCC; 1271 } 1272 } 1273 1274 if (resp == NULL) { 1275 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send " 1276 "empty response packet"); 1277 resp = wpabuf_alloc(1); 1278 } 1279 1280 return eap_fast_encrypt_response(sm, data, resp, req->identifier, 1281 out_data); 1282 } 1283 1284 1285 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data, 1286 struct eap_method_ret *ret, 1287 const struct eap_hdr *req, 1288 const struct wpabuf *in_data, 1289 struct wpabuf **out_data) 1290 { 1291 struct wpabuf *in_decrypted; 1292 int res; 1293 1294 wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for" 1295 " Phase 2", (unsigned long) wpabuf_len(in_data)); 1296 1297 if (data->pending_phase2_req) { 1298 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - " 1299 "skip decryption and use old data"); 1300 /* Clear TLS reassembly state. */ 1301 eap_peer_tls_reset_input(&data->ssl); 1302 1303 in_decrypted = data->pending_phase2_req; 1304 data->pending_phase2_req = NULL; 1305 goto continue_req; 1306 } 1307 1308 if (wpabuf_len(in_data) == 0) { 1309 /* Received TLS ACK - requesting more fragments */ 1310 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST, 1311 data->fast_version, 1312 req->identifier, NULL, out_data); 1313 } 1314 1315 res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); 1316 if (res) 1317 return res; 1318 1319 continue_req: 1320 wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)", 1321 in_decrypted); 1322 1323 if (wpabuf_len(in_decrypted) < 4) { 1324 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 " 1325 "TLV frame (len=%lu)", 1326 (unsigned long) wpabuf_len(in_decrypted)); 1327 wpabuf_free(in_decrypted); 1328 return -1; 1329 } 1330 1331 res = eap_fast_process_decrypted(sm, data, ret, req, 1332 in_decrypted, out_data); 1333 1334 wpabuf_free(in_decrypted); 1335 1336 return res; 1337 } 1338 1339 1340 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len) 1341 { 1342 const u8 *a_id; 1343 struct pac_tlv_hdr *hdr; 1344 1345 /* 1346 * Parse authority identity (A-ID) from the EAP-FAST/Start. This 1347 * supports both raw A-ID and one inside an A-ID TLV. 1348 */ 1349 a_id = buf; 1350 *id_len = len; 1351 if (len > sizeof(*hdr)) { 1352 int tlen; 1353 hdr = (struct pac_tlv_hdr *) buf; 1354 tlen = be_to_host16(hdr->len); 1355 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID && 1356 sizeof(*hdr) + tlen <= len) { 1357 wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV " 1358 "(Start)"); 1359 a_id = (u8 *) (hdr + 1); 1360 *id_len = tlen; 1361 } 1362 } 1363 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len); 1364 1365 return a_id; 1366 } 1367 1368 1369 static void eap_fast_select_pac(struct eap_fast_data *data, 1370 const u8 *a_id, size_t a_id_len) 1371 { 1372 data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len, 1373 PAC_TYPE_TUNNEL_PAC); 1374 if (data->current_pac == NULL) { 1375 /* 1376 * Tunnel PAC was not available for this A-ID. Try to use 1377 * Machine Authentication PAC, if one is available. 1378 */ 1379 data->current_pac = eap_fast_get_pac( 1380 data->pac, a_id, a_id_len, 1381 PAC_TYPE_MACHINE_AUTHENTICATION); 1382 } 1383 1384 if (data->current_pac) { 1385 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID " 1386 "(PAC-Type %d)", data->current_pac->pac_type); 1387 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info", 1388 data->current_pac->a_id_info, 1389 data->current_pac->a_id_info_len); 1390 } 1391 } 1392 1393 1394 static int eap_fast_use_pac_opaque(struct eap_sm *sm, 1395 struct eap_fast_data *data, 1396 struct eap_fast_pac *pac) 1397 { 1398 u8 *tlv; 1399 size_t tlv_len, olen; 1400 struct eap_tlv_hdr *ehdr; 1401 1402 olen = pac->pac_opaque_len; 1403 tlv_len = sizeof(*ehdr) + olen; 1404 tlv = os_malloc(tlv_len); 1405 if (tlv) { 1406 ehdr = (struct eap_tlv_hdr *) tlv; 1407 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE); 1408 ehdr->length = host_to_be16(olen); 1409 os_memcpy(ehdr + 1, pac->pac_opaque, olen); 1410 } 1411 if (tlv == NULL || 1412 tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1413 TLS_EXT_PAC_OPAQUE, 1414 tlv, tlv_len) < 0) { 1415 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS " 1416 "extension"); 1417 os_free(tlv); 1418 return -1; 1419 } 1420 os_free(tlv); 1421 1422 return 0; 1423 } 1424 1425 1426 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm, 1427 struct eap_fast_data *data) 1428 { 1429 if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn, 1430 TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) { 1431 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque " 1432 "TLS extension"); 1433 return -1; 1434 } 1435 return 0; 1436 } 1437 1438 1439 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm, 1440 struct eap_fast_data *data) 1441 { 1442 u8 ciphers[5]; 1443 int count = 0; 1444 1445 if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) { 1446 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated " 1447 "provisioning TLS cipher suites"); 1448 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA; 1449 } 1450 1451 if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) { 1452 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated " 1453 "provisioning TLS cipher suites"); 1454 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA; 1455 ciphers[count++] = TLS_CIPHER_AES128_SHA; 1456 ciphers[count++] = TLS_CIPHER_RC4_SHA; 1457 } 1458 1459 ciphers[count++] = TLS_CIPHER_NONE; 1460 1461 if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn, 1462 ciphers)) { 1463 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS " 1464 "cipher suites for provisioning"); 1465 return -1; 1466 } 1467 1468 return 0; 1469 } 1470 1471 1472 static int eap_fast_process_start(struct eap_sm *sm, 1473 struct eap_fast_data *data, u8 flags, 1474 const u8 *pos, size_t left) 1475 { 1476 const u8 *a_id; 1477 size_t a_id_len; 1478 1479 /* EAP-FAST Version negotiation (section 3.1) */ 1480 wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)", 1481 flags & EAP_TLS_VERSION_MASK, data->fast_version); 1482 if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version) 1483 data->fast_version = flags & EAP_TLS_VERSION_MASK; 1484 wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d", 1485 data->fast_version); 1486 1487 a_id = eap_fast_get_a_id(pos, left, &a_id_len); 1488 eap_fast_select_pac(data, a_id, a_id_len); 1489 1490 if (data->resuming && data->current_pac) { 1491 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - " 1492 "do not add PAC-Opaque to TLS ClientHello"); 1493 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1494 return -1; 1495 } else if (data->current_pac) { 1496 /* 1497 * PAC found for the A-ID and we are not resuming an old 1498 * session, so add PAC-Opaque extension to ClientHello. 1499 */ 1500 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0) 1501 return -1; 1502 } else { 1503 /* No PAC found, so we must provision one. */ 1504 if (!data->provisioning_allowed) { 1505 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and " 1506 "provisioning disabled"); 1507 return -1; 1508 } 1509 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - " 1510 "starting provisioning"); 1511 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 || 1512 eap_fast_clear_pac_opaque_ext(sm, data) < 0) 1513 return -1; 1514 data->provisioning = 1; 1515 } 1516 1517 return 0; 1518 } 1519 1520 1521 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv, 1522 struct eap_method_ret *ret, 1523 const struct wpabuf *reqData) 1524 { 1525 const struct eap_hdr *req; 1526 size_t left; 1527 int res; 1528 u8 flags, id; 1529 struct wpabuf *resp; 1530 const u8 *pos; 1531 struct eap_fast_data *data = priv; 1532 1533 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret, 1534 reqData, &left, &flags); 1535 if (pos == NULL) 1536 return NULL; 1537 1538 req = wpabuf_head(reqData); 1539 id = req->identifier; 1540 1541 if (flags & EAP_TLS_FLAGS_START) { 1542 if (eap_fast_process_start(sm, data, flags, pos, left) < 0) 1543 return NULL; 1544 1545 left = 0; /* A-ID is not used in further packet processing */ 1546 } 1547 1548 resp = NULL; 1549 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && 1550 !data->resuming) { 1551 /* Process tunneled (encrypted) phase 2 data. */ 1552 struct wpabuf msg; 1553 wpabuf_set(&msg, pos, left); 1554 res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp); 1555 if (res < 0) { 1556 ret->methodState = METHOD_DONE; 1557 ret->decision = DECISION_FAIL; 1558 /* 1559 * Ack possible Alert that may have caused failure in 1560 * decryption. 1561 */ 1562 res = 1; 1563 } 1564 } else { 1565 /* Continue processing TLS handshake (phase 1). */ 1566 res = eap_peer_tls_process_helper(sm, &data->ssl, 1567 EAP_TYPE_FAST, 1568 data->fast_version, id, pos, 1569 left, &resp); 1570 1571 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { 1572 char cipher[80]; 1573 wpa_printf(MSG_DEBUG, 1574 "EAP-FAST: TLS done, proceed to Phase 2"); 1575 if (data->provisioning && 1576 (!(data->provisioning_allowed & 1577 EAP_FAST_PROV_AUTH) || 1578 tls_get_cipher(sm->ssl_ctx, data->ssl.conn, 1579 cipher, sizeof(cipher)) < 0 || 1580 os_strstr(cipher, "ADH-") || 1581 os_strstr(cipher, "anon"))) { 1582 wpa_printf(MSG_DEBUG, "EAP-FAST: Using " 1583 "anonymous (unauthenticated) " 1584 "provisioning"); 1585 data->anon_provisioning = 1; 1586 } else 1587 data->anon_provisioning = 0; 1588 data->resuming = 0; 1589 eap_fast_derive_keys(sm, data); 1590 } 1591 1592 if (res == 2) { 1593 struct wpabuf msg; 1594 /* 1595 * Application data included in the handshake message. 1596 */ 1597 wpabuf_free(data->pending_phase2_req); 1598 data->pending_phase2_req = resp; 1599 resp = NULL; 1600 wpabuf_set(&msg, pos, left); 1601 res = eap_fast_decrypt(sm, data, ret, req, &msg, 1602 &resp); 1603 } 1604 } 1605 1606 if (res == 1) { 1607 wpabuf_free(resp); 1608 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST, 1609 data->fast_version); 1610 } 1611 1612 return resp; 1613 } 1614 1615 1616 #if 0 /* FIX */ 1617 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv) 1618 { 1619 struct eap_fast_data *data = priv; 1620 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 1621 } 1622 1623 1624 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv) 1625 { 1626 struct eap_fast_data *data = priv; 1627 os_free(data->key_block_p); 1628 data->key_block_p = NULL; 1629 wpabuf_free(data->pending_phase2_req); 1630 data->pending_phase2_req = NULL; 1631 } 1632 1633 1634 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv) 1635 { 1636 struct eap_fast_data *data = priv; 1637 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 1638 os_free(data); 1639 return NULL; 1640 } 1641 os_memset(data->key_data, 0, EAP_FAST_KEY_LEN); 1642 os_memset(data->emsk, 0, EAP_EMSK_LEN); 1643 os_free(data->session_id); 1644 data->session_id = NULL; 1645 if (data->phase2_priv && data->phase2_method && 1646 data->phase2_method->init_for_reauth) 1647 data->phase2_method->init_for_reauth(sm, data->phase2_priv); 1648 data->phase2_success = 0; 1649 data->resuming = 1; 1650 data->provisioning = 0; 1651 data->anon_provisioning = 0; 1652 data->simck_idx = 0; 1653 return priv; 1654 } 1655 #endif 1656 1657 1658 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf, 1659 size_t buflen, int verbose) 1660 { 1661 struct eap_fast_data *data = priv; 1662 int len, ret; 1663 1664 len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 1665 if (data->phase2_method) { 1666 ret = os_snprintf(buf + len, buflen - len, 1667 "EAP-FAST Phase2 method=%s\n", 1668 data->phase2_method->name); 1669 if (ret < 0 || (size_t) ret >= buflen - len) 1670 return len; 1671 len += ret; 1672 } 1673 return len; 1674 } 1675 1676 1677 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv) 1678 { 1679 struct eap_fast_data *data = priv; 1680 return data->success; 1681 } 1682 1683 1684 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len) 1685 { 1686 struct eap_fast_data *data = priv; 1687 u8 *key; 1688 1689 if (!data->success) 1690 return NULL; 1691 1692 key = os_malloc(EAP_FAST_KEY_LEN); 1693 if (key == NULL) 1694 return NULL; 1695 1696 *len = EAP_FAST_KEY_LEN; 1697 os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN); 1698 1699 return key; 1700 } 1701 1702 1703 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len) 1704 { 1705 struct eap_fast_data *data = priv; 1706 u8 *id; 1707 1708 if (!data->success) 1709 return NULL; 1710 1711 id = os_malloc(data->id_len); 1712 if (id == NULL) 1713 return NULL; 1714 1715 *len = data->id_len; 1716 os_memcpy(id, data->session_id, data->id_len); 1717 1718 return id; 1719 } 1720 1721 1722 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 1723 { 1724 struct eap_fast_data *data = priv; 1725 u8 *key; 1726 1727 if (!data->success) 1728 return NULL; 1729 1730 key = os_malloc(EAP_EMSK_LEN); 1731 if (key == NULL) 1732 return NULL; 1733 1734 *len = EAP_EMSK_LEN; 1735 os_memcpy(key, data->emsk, EAP_EMSK_LEN); 1736 1737 return key; 1738 } 1739 1740 1741 int eap_peer_fast_register(void) 1742 { 1743 struct eap_method *eap; 1744 int ret; 1745 1746 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 1747 EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST"); 1748 if (eap == NULL) 1749 return -1; 1750 1751 eap->init = eap_fast_init; 1752 eap->deinit = eap_fast_deinit; 1753 eap->process = eap_fast_process; 1754 eap->isKeyAvailable = eap_fast_isKeyAvailable; 1755 eap->getKey = eap_fast_getKey; 1756 eap->getSessionId = eap_fast_get_session_id; 1757 eap->get_status = eap_fast_get_status; 1758 #if 0 1759 eap->has_reauth_data = eap_fast_has_reauth_data; 1760 eap->deinit_for_reauth = eap_fast_deinit_for_reauth; 1761 eap->init_for_reauth = eap_fast_init_for_reauth; 1762 #endif 1763 eap->get_emsk = eap_fast_get_emsk; 1764 1765 ret = eap_peer_method_register(eap); 1766 if (ret) 1767 eap_peer_method_free(eap); 1768 return ret; 1769 } 1770
